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MedLine Citation:
PMID:  21673614     Owner:  NLM     Status:  Publisher    
PURPOSE:: To determine and compare 20-, 23-, and 25-gauge retinal infusion air jet impact pressure (force per unit area) in an experimental setting. METHODS:: Experimental laboratory investigation. Infusion cannulas were connected to a compressed air system. A controlled valve mechanism was used to obtain increasing levels of infusion pressure. Each infusion tube was positioned in front of a manual transducer to measure force. Impact pressure was calculated using known formulas in fluid dynamics. RESULTS:: The 20-gauge infusion jet showed similar impact pressure values compared with the 23-gauge infusion jet. Both showed higher levels than the 25-gauge infusion jet. This was because of the smaller jet force for the 25-gauge system. CONCLUSION:: In this experimental study, both the 23- and the 20-gauge air infusion jet showed higher impact pressure values compared with the 25-gauge air infusion jet. This could be of concern regarding air infusion during 23-gauge vitrectomy since retinal damage has been shown in standard-gauge surgeries.
Leonardo Machado Machadox; Octaviano Magalhães; Mauricio Maia; Eduardo B Rodrigues; Michel Eid Farah; Kamal Ar Ismail; Leandro Molon; Danilo A Oliveira
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-6-13
Journal Detail:
Title:  Retina (Philadelphia, Pa.)     Volume:  -     ISSN:  1539-2864     ISO Abbreviation:  -     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-6-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8309919     Medline TA:  Retina     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
From the *Department of Ophthalmology, Federal University of São Paulo, São Paulo, São Paulo, Brazil; and †Department of Ophthalmology, and ‡Department of Thermic and Fluid Engineering, Mechanical Engineering Faculty, State University of Campinas, Campinas, São Paulo, Brazil.
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